If you want to change the URL of a repository to which it points to, then this post is for you. If you try the same command:
git remote add origin http://github.com/USERNAME/OTHERREPOSITORY.git
then it is not gonna work and you will probably get error like this:
fatal: remote origin already exists.
List your existing remotes in order to get the name of the remote you want to change
git remote -v
Change your repository’s remote url with command:
git remote set-url origin https://github.com/USERNAME/OTHERREPOSITORY.git
Substitute the values of USERNAME and OTHERREPOSITORY with yours.
Mandeep Singh 